81079822331 has 2 divisors, whose sum is σ = 81079822332. Its totient is φ = 81079822330.

The previous prime is 81079822319. The next prime is 81079822339. The reversal of 81079822331 is 13322897018.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81079822331 is a prime.

It is a super-2 number, since 2×81079822331² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81079822339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40539911165 + 40539911166.

It is an arithmetic number, because the mean of its divisors is an integer number (40539911166).

Almost surely, 2^81079822331 is an apocalyptic number.

81079822331 is a deficient number, since it is larger than the sum of its proper divisors (1).

81079822331 is an equidigital number, since it uses as much as digits as its factorization.

81079822331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 81079822331 in words is "eighty-one billion, seventy-nine million, eight hundred twenty-two thousand, three hundred thirty-one".